I installed msys with the latest mingw-get win32 installer and I made sure to select pkginfo after I saw this error in the log but it didn't help. (This package was unavailable but I filed a bug report and it is available now. I have it installed now, even though the mingw-get package maintainer suggested that I should need this for compiling anything like ffmpeg, so this can be my misunderstanding. But the configuration fails regardless...)

ICL13 is properly installed and it seems to work correctly (I already compiled some other source code from the command line and the programs work on my PC.)

I have the same bug with c99wrap 1.0.1. It just does nothing with -noconv option. Upgrade to c99-to-88 v1.0.2 resolved issue with c99wrap. Please note what c99-to-88 1.0.2 contains another bug in makedef tool(​https://github.com/libav/c99-to-c89/issues/9).